From the actions of American armed forces before the Revolutionary War to present-day conflicts around the world, this tear-off daily calendar chronicles weapons, battles, commanders, and key events that made their mark on U.S. history. January 31 commemorates the 1865 passage of the 13th Amendment, abolishing slavery, while Saturday, December 7, marks the day in 1941 when Japan bombed Pearl Harbor, sharing the page with Sunday, December 8, which in 1775 saw the start of the American siege of Quebec.